freeman



(No Model.) 2 Sheets-Sheet 2.

W. P. FREEMAN.

INSTRUMENT FOR G'ALKING SHIPS.

No. 606,199. Patented June 28,1898.

Rat-7% W EZMW sirrn A'rnN'r nrrcno \VARRE N P. FREEMAN, OF'NEIV YORK, N. Y.

INSTRUMENT FOR CALKENG SHlPS.

SPECIFICATION forming part of Letters Patent No. 606,199, dated June 28, 1898.

Application filed June 22, 1897. Serial No. 641,805. (No model.)

To all whom, it may concern: 1

Be it known that I, W ARREN P. FREEMAN, of the city and State of New York, have invented certain new and useful Improvements in Instruments Suitable for Oalkin g Ships and other Uses, of which the following is a description, referring to the accompanying drawings,

which form a part of this specification.

In an application filed herewith, Serial No. 641,800, I have shown and'described a portable instrument for cleaning paint from ships plates and other surfaces, dressing stone, and other uses in'which the working edge or end of the instrument is given a rapid reciprocating motion, causing it to strike a'rapid succession of blows. In the same application I have described and shown means for suspending the instrument and readily adjusting it forward and backward, up and down, and laterally. The same manner of suspending and adjusting is applicable to the present invention. The reciprocation of the tool in the present invention, as in the application just referred to, is preferably produced by an electric motor; but instead of actuating the tool directly by an eccentric the present apparatus includes in its most preferred form red uctiongearing, so that several revolutions of the driving-shaft produce a single movement of the tool. The parts are arranged symmetrically around the axis of the reciprocating tool.

The several patentable features, together with the construction and operation of the device as a whole in its preferred form, will be clearly understood from a description of the accompanying drawings, wherein Figure 1 is a plan view of the instrument with the working end or tool proper removed, the suspending device taken off, the upper plate or cover of the instrument partly broken away to show the interior, and part of the casing shown in section to disclose the interior.

Fig. 2 is the side elevation of the instrument itself without the suspending device, show ing part of the casing in section, so as to disclose one armature and commutator-brushes. Fig.3 is a central longitudinal vertical section showing one field-coil and the reciprocating tool-holder and gearing in full and not in section. Fig. eis a transverse vertical section in the plane of the armature-shaft, and

Fig. 5 shows the instrument mounted similarly to a rock-drill.

Throughout the drawings like letters of reference indicate like parts.

The field-magnet pole-pieces virtually form the casing or box of the-electric motor andof the reciprocating apparatus. The pole-pieces are lettered N and S, respectively, and they embrace the two field-coils O C at one end and two sides. The magnetic core of the coils O 0 consists of two iron plates D, which con nect the two pole pieces N S lengthwise through the two coils. There are two armatures E, mounted on a transverse shaft F in bearings in the 'plates'D. 'Where the two plates D enter the respective coils O 0 they meet and form an annular core, around which the coils are placed and through the bore of which the reciprocating bar or tool-holder G operates. This bar G has hearings or guides in the pole-pieces N and S, as clearly shown in the figures. The plates D are of the form shown at the center of the apparatus in order to give space for the reduction-gearing and connections for reciprocating the toolbar G. Y

The commutators are on the ends of the shaft, and the brushes and commutators are inclosed in the cup-shaped casings II. Two plates J inclose the instrument above and below, while the field-magnet poles and casings H inclose it at the sides. 0n the armature-shaft F is the disk K, which is provided with the pin L, which actuates the Geneva wheel M. The Geneva wheel shown has six recesses for the pin, so that six revolutions of the armature-shaft cause a single revolution of the Geneva wheel. The cam-shaped piece which holds the Geneva gear stationary when the pin is out of engagement with it is shown at O. The Geneva wheel M is mounted on the arbor I, which turns in the plates D, as shown. Mounted upon and turning with the arbor P is the cam B, Fig. 1, (shown in dotted lines in Fig. 3,) which once in each revolution engages the projection T upon the bar G and forces the bar backward against the action of the stiff spring V. 7 As soon as the cam R clears the end of the engaging projection T the compressed. spring V drives the bar or tool-holder G forward with its full force.

contrary,

Each revolution of the shaft F turns the Ge neva wheel one-sixth of a revolution. Durin g about three of these movements the spring V is being compressed, the power developed by the motor being stored up in the spring. As soon as the cam releases the bar the storednp power is delivered to the tool and the Ge neva wheel is free to turn three notches before it again engages projection T. If the weight of the armature is considerable, this interval when the motor is working against no mechanical resistance will represent a slight increase of speed and accumulated momentum in the motor, which is of course used up in turn in forcing the tool-bar G back against the action of the spring V.

The electrical circuits, as diagram ma ticall y indicated, are of the shunt type and con trolled by the switch IV, conveniently placed upon the casing of the instrument. The electrical terminals of the instrument are indicated at w 10, respectively. In using the instrument for calking ships sides the ealking-tool is secured in the recess 9 in the end of the bar G. The switch 7 is then closed and the tool thereby started. The comparatively slow strong thrust of the bar G makes the instrument very effective.

It must not be understood that the precise form of motor or the arrangement of the parts described is essential to the carrying out of the invention in its broader aspects. On the I claim, and desire to secure by Letters Patent, the following:

1. The electric motor provided with two armatures, the reciproeatin g tool-holder mounted in operative relation to the armature-shaft of the said motor between the two armatures, and gearing operatively connecting the armatureshaft with the tool-holder for reciprocatin g the same, substantially as set forth.

2. The electric motor provided with two armatures, the reciprocating tool-holder mounted in operative relation to the armature-shaft of the said motor between the two armatures,

operative connections between the arinatu re shaft and the reciprocating tool-holder for moving the holder in one direction, and a spring for moving the tool-holder in the opposite direction, substantially as set forth.

3. The electric motor previd ed with two armatures, the reciprocating tool-holder moun ted in operative relation to the arniature-shal't of the said motor between the two arinatures, the Geneva gearing driven by the said arnnu ture-shaft and turning the cam It, a spring acting upon the tool-holder, and a projection upon the said tool-holder with which the said cam engages and forces the tool-holder bachward against the action of the said. srn'ing, substantially as set forth.

4-. In combination, the double iiehl-niagnet and pair of armatures, the field-magnet win d-- ings and core extending longitiulinally between the said pole-pieces, the tool-holder or? tending axially through the said coils, and re duction-gearing, operatively connecting the shaft of the electric motor with the said tool holder, substantially as set forth.

5. In combination, the double lieldenagnot, the two armatures mounted on a shaft which is supported between the armatures at the central and neutral point of the field-magnets, and a tool actuated by the said shaft and so pported upon the iiield-nntgnelis.

6. In combination, an electric motor, a reciprocating tool-holder, spring acting on the tool-holder in one direction, and the lhincva gearing actuating the said tool-holder intei mittingly in the opposite direction, substantially as set forth.

'7. In combination, a rotary motor, a reciprocating tool-holder, and a Geneva gear, intermittently actuating the said tool-holder, substantially as set forth.

In testimony whereof I have hereunto set my hand this 17th day of June, 1897.

Ulltltlllllt P. I it ii. i llll d it Witnesses:

Gnondn ll. sonxinaoim, HAROLD Brnnnv, 

